<script setup>
import { getRecommendAPI } from "@/api/home";
import { onLoad } from "@dcloudio/uni-app";
import { computed, ref } from "vue";

const urlMap = {
  1: { title: "特惠推荐", url: "/hot/preference" },
  2: { title: "爆款推荐", url: "/hot/inVogue" },
  3: { title: "一站买全", url: "/hot/oneStop" },
  4: { title: "新鲜好物", url: "/hot/new" },
};

const bannerSrc = ref("");
const subTypes = ref([]);
const activeIndex = ref(0);

const loading = ref(false);

const loadData = async (url, data) => {
  if (loading.value === true) return;

  loading.value = true;
  const { result } = await getRecommendAPI(url, data);
  loading.value = false;

  if (!data) {
    subTypes.value = result.subTypes;
    bannerSrc.value = result.bannerPicture;
  } else {
    const oldItem = subTypes.value[activeIndex.value].goodsItems;
    const newItem = result.subTypes[activeIndex.value].goodsItems;
    oldItem.items.push(...newItem.items);
    oldItem.page = newItem.page;
    oldItem.pages = newItem.pages;
  }
};

const currentUrl = ref("");
const loadMore = () => {
  const currentSubType = subTypes.value[activeIndex.value];

  if (currentSubType.goodsItems.page === currentSubType.goodsItems.pages) return;

  loadData(currentUrl.value, {
    subType: currentSubType.id,
    page: currentSubType.goodsItems.page + 1,
    pageSize: 50,
  });
};

const finished = computed(() => {
  const currentSubType = subTypes.value[activeIndex.value];
  if (currentSubType.goodsItems.page === currentSubType.goodsItems.pages) return true;
  else return false;
});

//
onLoad(({ type }) => {
  const currentItem = urlMap[type];
  uni.setNavigationBarTitle({ title: currentItem.title });
  currentUrl.value = currentItem.url;
  loadData(currentItem.url);
});
</script>

<template>
  <view class="viewport">
    <!-- 推荐封面 -->
    <view class="cover">
      <image :src="bannerSrc" />
    </view>
    <!-- tab栏 -->
    <view class="tabs">
      <text
        v-for="(item, index) in subTypes"
        :key="item.id"
        class="text"
        :class="{ active: index === activeIndex }"
        @click="activeIndex = index"
      >
        {{ item.title }}
      </text>
    </view>

    <scroll-view
      scroll-y
      class="scroll-view"
      @scrolltolower="loadMore"
      v-for="(item, index) in subTypes"
      :key="item.id"
      v-show="index === activeIndex"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in item.goodsItems.items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>

      <!-- 7. 条件渲染-实现停止请求更多数据 -->
      <view v-if="finished" class="loading">没有更多数据了</view>
      <view v-else class="loading">正在加载...</view>
    </scroll-view>
  </view>
</template>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}
.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}
.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}
.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
  .text {
    margin: 0 20rpx;
    position: relative;
  }
  .active {
    &::after {
      content: "";
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}
.scroll-view {
  flex: 1;
  overflow: hidden;
}
.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;
  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }
  .thumb {
    width: 305rpx;
    height: 305rpx;
  }
  .name {
    height: 88rpx;
    font-size: 26rpx;
  }
  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}
.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>
